# Accelerated Stability Kinetic Modelling

## Overview

This package utilises the Šesták–Berggren equation alongside the Arrhenius equation to make a simple and consistent way for a user to carry out the calculations and predictions required by accelerated stability studies. Currently the package works with decreasing variables, you may choose to transform your increasing variable into a decreasing one but note that your choice of transformation can impact the outcome.

The available functions within the package are as follows:

`step1_down()`

Fit the one-step Šesták–Berggren kinetic model.
`step1_plot_desc()`

Plot the stability data.
`step1_plot_pred()`

Plot the stability data and visualise the predictions.
`step1_plot_CI()`

Plot the stability data and visualise the predictions with confidence intervals.
`step1_plot_PI()`

Plot the stability data and visualise the predictions with prediction intervals.
`step1_plot_T()`

Plot the stability data and visualise the predictions with focus on one temperature.
`excursion()`

Predict a temperature excursion for a product.
`step1_down_rmse()`

Calculate Root Mean Square Error (RMSE) for the one-step Šesták–Berggren kinetic model.
`step1_plot_diagnostic()`

Generate residual diagnostic plots from a step1_down fit.
`step1_sample_mvt()`

Take a selected number of samples from the multivariate t distribution.

## Installation

Install AccelStab the following way -

## Feedback

Log an issue here or contact a moderator.